Java Utililty Methods Random Number

List of utility methods to do Random Number

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Description

The list of methods to do Random Number are organized into topic(s).

Method

StringgenerateRandomnumber(int firstNum, int restNum)
generate Randomnumber 
Random random = new Random(System.currentTimeMillis());
String first = String.valueOf(random.nextInt(firstNum));
String rest = String.valueOf(random.nextInt(restNum));
return first + rest;
intgenerateRandomNumber(int from, int to)
Generates random number in given range. 
return r.nextInt(to - from + 1) + from;
StringgenerateRandomNumber(int length)
generate Random Number 
Random random = new Random();
String val = "";
for (int i = 0; i < length; i++) {
    val += String.valueOf(random.nextInt(10));
return val;
intgenerateRandomNumber(int min, int max)
generate Random Number 
return (int) (min + (Math.random() * ((max - min) + 1)));
intgenerateRandomNumber(int min, int max)
Generates a random number in the range [min, max] 
return min + (int) (Math.random() * ((max - min) + 1));
intgenerateRandomNumber(int start, int end)
Generates the random number within the range. 
double randomValue = Math.random();
int randomNumber = (int) (start + Math.round(randomValue * (end - start)));
return randomNumber;
intgenerateRandomNumberBetween(final int low, final int high)
generate Random Number Between 
return low + new Random().nextInt(high - low);
StringgenerateRandomNumericString(int maxLength)
generate Random Numeric String 
Random random = new Random();
Long number = new Long((Math.round(Math.random() * maxLength)));
return number.toString();
StringgenerateSaltNumber()
generate Salt Number 
Random random = new Random(System.nanoTime());
StringBuilder saltNumber = new StringBuilder();
for (byte i = 0; i < SALT_NUMBER_SIZE; i++) {
    saltNumber.append(random.nextInt(10));
return saltNumber.toString();
StringgenRandomNum(int pwd_len)
gen Random Num 
final int maxNum = 36;
int i;
int count = 0;
char[] str = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };
StringBuffer pwd = new StringBuffer("");
Random r = new Random();
while (count < pwd_len) {
    i = Math.abs(r.nextInt(maxNum));
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